Centering and holding means for cutter heads and the like



Dec" 9, 1924* 1,518,716

E. H. WA UGH CENTERING AND HOLDING MEANS FOR CUTTER HEADS AND THE LTKE Filed Oct. 15, L925 Edvard f7. Wavy/1 Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

EDWARD H. WAUGH, OF SEATTLE, WASHINGTON, ASSIGNOR TO SMITH CANNERY. MA- GHINES COMPANY, OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

GENTERING AND HOLDING MEANS FOR CUTTER HEADS AND THE LIKE.

Application filed October 15, 1923.

To all whom it may concern:

Be it known that I, EDWARD H. l/VAUGH,

a citizen of the United States of America,

and resident of the city of Seattle, in the county of King and State of \Vashington, have invented certain new and useful Improvements in Centering and Holding Means for Cutter Heads and the like, of which the following is a specification.

My invention relates to a construction adapted for centering and holding cutter heads and other like tools upon a revolving shaft.

The object of my invention is to provide a type of construction which will be relatively cheap in manufacture, simple and easy to use, and by which the accurate positioning and centering of a. cutter head or other revolving member upon a shaft may be secured. Y

My invention consists of certain novel constructions and combinations of parts, which will be hereinafter described and then specifically pointed out in the claims.

In the accompanying drawings I have shown my invention as applied to the mounting of a cutter head upon a shaft, the same being illustrated in the type of construction which I prefer to use.

Figure 1 is a longitudinal or axial section through the cutter head.

Figure 2 is an end view of the cutter, taken from the side at which the shaft is inserted, the shaft, however, not being illustrated.

Figure 3 is a view, partially in section, taken upon the line 3-3 of Figure 1.

In operating machines employing cutter heads or like tools, such, for instance, as those used for shaping and dressing lumber, 40 it is desirable to have the same provided with means by which the accurate positioning of the cutter head may be secured without necessitating great accuracy of measurement and adjustment, and also means which will 45 hold the same securely upon the shaft so that the head for the time being is, in effect,

an integral part of the shaft.

In the drawings, 2 represents the shaft upon which a cutter head 1 is mounted. The

Serial No. 668,535.

cutter head 1 is shown as having a sleeve 10 projecting at one side. The sleeve and head are bored axially so as to provide a shaft receiving bore which is sufficiently larger than the shaft to permit easy placing of the head upon the shaft and removal therefrom when the holding means are not in action. The cutter head and sleeve 10 is provided with keyways 11 extending lengthwise thereof and preferably throughout the entire length of the cutter head and sleeve. These keyways are made inclined, that is, the bottom thereof is not exactly parallel with the axis of the head. The keys 20, of which three are shown, as employed, are made correspondingly tapered so that the inner face of the keys when seated in their keyways is parallel with the axis of the head and shaft.

To hold the keys in proper relative position at the end at which the shaft is inserted, they are secured together by a ring 21 which may be a piece of fairly heavy wire passing through slots in the ends of the keys. This will hold the keys outwardly and prevent their collapsing towards the center when the shaft is removed. At the other end of the cutter head the keys 20 are supported in notches 30 formed in the outer edge of a thrust plate 8 which is secured to the head. These keys are also provided on their inner surface with notches 22 which form segments of a thread.

The thrust plate 3 is shown as secured in the head by screwing into a counterbore formed in the end thereof which counterbore extends to the outer edge of the key ways so that the keys may be drawn outwardly at this end so as to project beyond the end of the head, if this be necessary.

Within a counterbore 12 formed in the same end of the sleeve 10, is placed a key actuating screw 4: which is in the form of a ring like block externally threaded complementary to the threads upon the keyways. The threads of this screw block mesh with the threads of the keyways and by turning said screw block, if it is held against movement axially of the head, the keys will be moved lengthwise so as to be powerfully readily turned.

drawn down upon the shaft 2. The screw block a should he operable from without the head. A convenient way to do this is to provide a thrust bolt 5 which has an inner end section of slightly reduced diameter threaded into the screw block 4: and then secured against turning by means of keys as 40. Any suitable means by which these two parts may be rigidly secured together may be employed. The thrust bolt 5 has an enlarged head 51 which,.when the shoulder of said bolt is in engagement with the outer face of the screw block 4, will closely engage the outer face oft-he thrust plate 3, but not clamp the same so but that the thrust bolt may be easily turned. The outer end of the thrust bolt is also provided with a head of non-circular shape such that it may be As illustrated this is done by providing a squared head For convenience in accurately positioning the head upon the shaft in an axial direction the adjusting bolt 6 is employed. This is threaded in an axial bore in the thrust bolt 5 and engages the end of the shaft by its inner end. By properly setting this bolt and leaving it in this position, it is possible to remove the head and replace it in exactly the same axial position without any necessity for measurements.

Turning of the thrust plate 3 is prevented by the end of the keys 20 which lie in the slots 30 in said plate. It is evident that if the thrust bolt 5 be turned the screw block 4 carried thereby, acting as a bolt inside of the nut formed by the threaded inner surfaces of the keys 20, will cause the keys to move lengthwise of the shaft. Thus, by reason of the taper of these keys either lightening or loosening the head upon the shaft is secured, in accordance with the direction of movement of the keys. It is also evident, by reason of the fact that a series of keys are employed, that the head will be clamped with its axis exactly coinciding with the axis of the shaft. This makes it possible to bore the head just enough larger than the shaft to permit of its being freely placed thereon and removed therefrom. Keyways 23 provided in the shaft 2 cooperate with. set bolts 2 acting as keys, to angularly position the head upon the shaft and also to prevent turning between the two.

YVhat I claim as my invention is:

1. A shaft centering and holding device for cutter heads and like tools having a shaft-receiving bore, of inclined keyways in said bore, taper keys in said keyways and means for simultaneously and equally drawing up all of said keys, and an adjustable stop carried by the key tightening means in position to engage the shaft end to accurately position the head upon the shaft in an axial direction.

2. A shaft centering and holding device for cutter heads and like tools having a shaft receiving bore, comprising inclined keyways in said bore, taper keys fitting said keyways, a spacing ring connecting one end of said keys, means engaging the other end of the keys to hold them outward in the keyways, and means for simultaneously and adjusting said keys an ways.

3. A shaft centering and holding device for cutter heads and like tools having a shaft receiving bore, comprising inclined keyways in said bore, taper keys fitting said keyways, a spacing ring connecting one end of said keys, means mounted in one end of the bore for holding the other end of the keys in the keyways and means engaging the samee-nd of the keys to simultaneously and equally adjust them along the keyways.

4. A shaft centering and holding device for cutter heads. and like tools comprising a sleeve forming a part of the tool body and having keyways in its inner surface, taper keys litting said keyw'ays and having their inner faces cut to form segments of a screw thread, a thrust plate screw threaded into one end of the sleeve, a key-tighteningblock 7 exterior-1y threaded to engage the threads on the keys and lying inward of the thrust ring, and a thrust bolt having a head engaging the outer face of the thrust ring and having rotatively fixed engagement with the tightening block.

5. A shaft centering and holding device for cutter heads and like tools having a shaft receiving bore, comprising keyways in said bore, taper keys fitting said keyways and having their inner faces threaded at their smaller ends to form threaded segments of a nut, a key-tightening ring meshing with the threads of said keys, a thrust ring secured to the head and an actuating bolt having rotatively fixed engagement with the key-tightening ring and a thrust engagement with the outer face of the thrust ring.

6. A shaft centering and holding device I for cutter heads and like tools having a shaft receiving bore, comprisingkeyways in said bore, taper keys fitting said keyways and having their inner faces threaded at their smallerends to form threaded segments of a nut, a threaded actuating ring meshing with the threads of said keys, a thrust ring secured to the head and an actuating bolt having rotatively fixed engagement with the said ring and a thrust engagentient with the outer face of the thrust ring, said actuating bolt having a threaded axial bore and an adjusting bolt in said bore.

7. A shaft centering and holding device for cutter heads and like tools comprising a bore in said head of a size to make a loose fit over the shaft, said bore having inclined keyways therein, a thrust plate screwing into one end of said bore and having notches for the reception of one end of the keys, taper keys having their inner faces at one end threaded, a keytightening block exteriorly threaded to engage with the threads of the keys and having a thrust bearing against the inner face of the thrust plate, and an actuating bolt fixedly secured to the tightening block and having a thrust hearing against the outer face of the thrust plate.

Signed at Seattle, King County, Washington, this 5th day of October 1923.

EDWARD H. WVAUGH. 

